Electric coupling



Dec. 30, 1930. F. coATEs 1,786,600

ELECTRIC COUPLING "Filed Jan. s, 1929 Patented Dec. 3Q,y 1930 f UNITED STATES; PATENT OFFICE FRANK CoATEs, or CLEADoN, ENGLAND, AssIGNoRro A; REYROLLE a COMPANY LIMITED, E HEBDURN-oN-TYNE, ENGLAND, ACQMPANY or` GREA'I` BRITAIN ELECTRIC CouPLING f 'Application filed January 3, 1929, Serial' No. 329,99l-,?and inl lGreat.Britain lMarch 6, 1928.

This invention relates to electric couplings of the metal-clad orifice type in which a conductor usually terminating in a socket is surrounded by a condenser contained within thel 5 orifice of a metal casing.y Such couplings are often used, for instance, in metal-clad switchgear of `the draw-out type.

The condenser portion of such a coupling is generally made of yalternate layers of im-y 1 pregnated paper or like insulating material and thin metal sheet or foil, and the insulating material is to some extent hygioscopic. .There is, therefore, sometimes a 'tendency for moisture'to collect and for the dielectric strength of the arrangement to be reduced.

To obviate this a metal-clad orifice coupling according to the present invention is provided with an inner liner of porcelain or like impervious insulating material which 2o makes a closed joint with the outer end or mouth of the metal casingand forms an enclosing inner'cover for the condenser which is contained in the annular space between the 'liner and the metal casing. y Conveniently this inner liner is bellshaped with a hollow neck or a hole at its inner end where it makes a joint with a cent-ral conductor which passes through it and terminates in a socket. The outer end of the liner may be flared or flanged and may be clamped or otherwise secured to the mouth of the casing with which it makes a closed joint. f

Preferably there is inside the casing a disc or lspider forming a suport for the condenser which is held clear of the casing and also ofthe insulating inner liner.` The space around the condenser may be wholly or partially filled by compound or by oil or like insulating fluid.

In the accompanying drawings,

Figure l is a central section of one con.

`In the construction shown in Figure l aV central conductor A terminating in a socket A1 carries a spider B upon which a con. denser C is supported the whole 'being withina metal casingD .which may be mounted ODfOr form part of metaleclad switchgear.

yAbell-shaped liner E ofporcelain or like impervious insulating. material having a hole at its inner end makes a joint with the inwardly projecting end of the central conductor A, this .joint being rendered oil-tight by means of oil-resisting washers F. The

outer vend of the liner E is flanged and se-v cured by means of studs G to the mouth of the metal casing D so as to make a closedkIn the modified construction, illustrated in Figure 2, which is particularly adapted to be filled with insulating compound, the inner f liner E1 has a neck atits inner end where it is secured tothe inwardly projecting portion I or socket end of the-central conductor A2 by means ofceinent J. The outer edge of the "linerEl is flared andV is secured to the mouth of the metal casingD1 by means of cement K. The space around the condenser C is wholly orl partially filled with insulating compound.

What claim as my invention and desire to secure by Letters Patent is 1. A metal-clad electric coupling of the condenser orifice type comprising a conductor, a tubular condenser supported around said conductor, a metal casing aroundsaid one end a hole through which the conductor .A

passes, said inner member being flanged at the other end Where it forms a closed joint with the outer end or mouth of said metal casing.

3. A metal-ciad electric coupling of the Condenser orifice type comprising a Conductor, a tubular condenser supported around said conductor, a metal casing-gl around said condenser7 an inner member of impervious insulating material attached to said Conductor and forming a closed joint with the outer end or mouth of said metal easing, and means attached to said conductor Jfor supporting the tubular condenser clear of the Casingand the inner member7 thus providing a spaceadapted to contain an insulating medium.

In testimony whereof I have signed my naine to this specification.

FRANK COATES. 

